Screw-driving machine.



W. P. HUNT.

' SCREW DRIVING MACHINE. APRLIOATION FILED MAR 30. 19 06.

950,534. Patented Mar. 1, 1910.

3 BEEETS-SEEET 1.

W. P. HUNT.-

SGREW DRIVING MACHINE. 4 APPLICATION FILED MAR 30, 1906.

Patented Mar. 1, 1910.

3 SHEETS-SHEET 2.

W P HUNT SCREW DRIVING MACHINE. l APPLIUATION FILED ME 30 1906 956,534, Patented Mar. 1, 1910. a mama-$113M 3.

' UNITED sTAIrEs PATENT OFFICE.

WILSON P. HUNT, OF MOLINE, ILLINOIS, ASSIGNOR TO G. D. REYNOLDS OF ROCK ISLAND, ILLINOIS, A FIRM.

Specification of Letters Patent.

& COMPANY,

Patented Mar. 1, 1910.

Application filed March 30, 1906. Serial No. 309,009.

To all whom it may concern:

.Be it known that -I, WILSON P. HUNT, a citizen of the United States, and a resident of Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Screw-Driving Machines, of which the following is a clear, full, and exact description.

My invention relates toa screw driving machine, and is designed for "use in shops and factories having work in which it is desired to set screws with greater accuracy and rapidity than could possibly be done by hand.

The object ofmy invention is to feed the screws to the driver from a suitable magazine one by one as rapidly as the ability of the operator makes it .nccc sa lya .no matter what the size of the screws are, and to prevent the screws being driven into the work so far that the head is buried and the hold of the screw impaired, substantially as hereinafter, more fully explained and as particularly pointed out in the claims.

In the drawings :Figure l is a front elevation of my invention with the lower part of the standard of the machine broken away. Fig. 2 is a side elevation of the same. Fig. 3 is a front elevation similar to that shown in Fig. 1, omitting the standard, and showing the magazine, the chuck and the parts on the upper end. pf the driving shaft in vertical section. Fig. 4 is :1 Ian view'the'reof. Fig. 5 is a perspective View of one of the jaws that clamp the screws during the insertion of the same into the work, drawn to a larger scale. view showing the several parts of the magazine involved in expelling the screws, with the exception of the annular side-wall and revolving table thereof, from their normal assembled position and drawn in perspective. Figs. 7 and 8 show vertical sections of the chuck separatedfroni the machine. Fig. 9 is a perspective view of the tubular filler of said chuck. Fig. 10 is a fragmental detail section taken in a vertical plane at right angles to Fig. 1 through the center of the main operating shafts, and drawn to a larger scale. Fig. 11 is a top plan view of a fragmental portion of the screwy-feeding mechanism. Fig. 12',is a vertical section taken on line 12-12 Fig. 11,

Fig. 6 is a diagrammatical slightly separated in proper relation.

and, Fig. 13, is a vertical section thereof taken at right angles to Fig. 12.

Referring to the drawings A" represents a vertical standard having a suitable table B adjustable verticall thereon. The standard extends above t e position in which the work is fed to the machine, and has bolted or otherwise secured to its upper end, a supporting-plate C for the framework in which the operative parts of the machine are held This supporting framework consists principally of a transversely disposed bearing a for the drive-shaft Z) 'of the machine, and vertical bearings c for the vertically reciprocal tubular shaft (l. The bore of bearings c'is open to the bore of bearings a at about the centers of length thereof, to permit of the engagement of said vertical shaft by the-drive-shaft, through the medium of a worm-gear Y splined on the tubular shaft (Z and a worm X keyed on drive-shaft Z) and located in a suitable chamber made in the transverse bearings a and engaging said worm-gear. This leaves the vertical shaft free to reciprocate longitudinally but imparts the revolving motion of the drive-shaft thereto.

Secured to and projecting laterally from a suitable external fiat surface on the side of vertical bearings c is a bracket D. At about its center of length the horizontal por-' tion of this bracketis provided with vertical bearings for a vertical spindle e, which bracket has its ends bent or curved downward and. forms an arch for a magazine", comprising an annular side-wall E, and a circular table G on the lower end of thc spindlee. This annular sidewall E has its lower edges f flanged inward and beveled on their upper side, and the circular table G, teen. is secured to the spindle e in the same horizontal plane as said flanged edges ls substantially concentric with said edges but removed therefrom a distance corresponding to the diameter of the barrel of the screws to, be deposited therein, and the circumferential edge of the table is likewise beveled on its upper side corresponding to the bevel the flanged edges f. The spindle e is driven at a slow speed by means of a worm gear e thereon, which latter is 'engagedb'y a worm F on the adjacent extended end of the drive-shaft b. As'stated, table G is of such diameter that its edges 1 magazine fall, and

i I edges of the table and flange.

The discharge opening is made by reccssmg the annularwall, and the portion thereof -in'the under edge of the said wall E, is

are opposite i but separated from the edge of the flange 7' l of the annular wall, so that a. circular s ace or runway w is left between them, into W Hill the barrels of the screws su plied to the are suspen ed by reason of the heads-thereof resting on the beveled As said table slowly revolves the screws are moved around to a point nearest the vertical-bearings a, where they are dropped, one by one, through a. suitable recess in the flange f into a tubular chute g, which latter extends down from the rim of the magazine to the chuck, as will hereinafter be more full described.

Secured to the rear portion 0 thewall E is a suitable bearing h for a substantially horizontal shaft 72/, whose forward end extends, be 0nd its bearings above the magazine, an is driven by a worm gear h", which is actuated by the same worm F that actuates spindle 6. Between this worm gear h and the adjacent end of the bearings of shaft h, the latter has a circular brush l1. secured thereto, the diameter of the periphery of the wires com osing which is such that said wires brusli back any surplus screws that maybe carried forward by the revolving table, and allow only those to pass which are suspended by their heads'in the annular runway.

From a point directly under shaft h to a point beyond the discharge opening of the ma azine I prefer to cover over the runway ay a segmental bar M that fits inside and is secured against the inner surface of the annular wall E just above the flange f thereof. This prevents the screws after they pass the brush, from crowding each other to such an extent that they would climb upward. I also secure to the under side of the rim, in such position as to be disposed about an equal distance oiu either side of the discharge opening of the magazine, a short segmental plate J, which latter is provided with a vertical slot j, in the portion thereof on the side of the discharge opening toward which the screws approach, to permit of the passage of.the pendent screw-threaded" portions of the screws until the same "is over the discharge opening.

the under edge of the annular wall E including a portion of the flange f, on the side of the magazine, preferably, nearest the vertical brarings c of the machine. This recess is occupied by a tri k that consists of a flat piece of metal in cruined mediate its ends by a screw, which latter assists in securing plate J to the wall of the magazine. The trip is is arranged in a tangential direction to the outer circumference of extending from its fulcrum into the recess slightly more than twice the width of that portion .of the trip projcctin posite direction from its fu crum, This roader part or head'of the tripus kept pressing inward by a spring'm placed between its'opposite end and the adjacent outer circumference of the wall E, as shown. The inner edge of the head 'ortion of the trip partially laps over and? rms a yielding section of the outer[- 'vall the runway 1n the opand is beveled on its appen ed, As the screws move toward thfif ptlli v will be discharged fronilithe' gazi'ne they are engaged and retarded byfthe trip and come into position under a vertical y reciprocating plunger 2, one after another in close order. The lower end of this plunger moves through a suitable guide-opening in the segmental bar M, and has a finger 3 extending straight do\\-'nward from its lower extremity through-the annular runway and forms a stop for the screws ,in the same, at a point immediately overthe discharge opening. In this position the screw is suspended betwecn the table and the trip, and when the plunger moves downward it engages the screw and thereby makes trip K yield outward to permit the screw to pass downward into the chute Chute g ektendsjjdownward in a avltere they and forces it downward lateral y inclined direction toward,,and has I its lower end secured in an alining stub 4' rojecting from the adjacent side of a tubuar extension 6, whose upper .end is 'fianged and secured to and depending from the bushing 6 in the lower end of the vertical bearing a. The part of the extension 5 above the plane of stub 4 may have elongated o'enmgs in its side, if desired; the part be ow said stub has its bore reduced and occupied by a filler tube 8, that is held in place by a Set-screw 9, and has its lower end extended below the lower extremity of the chuck and, )referably,iprovided with a circumferential ange to strengthen it. This tube 8 is cut away to permit the screw from the chute g to enter its bore, and its portion between its lower flanged edges and the lower end of the chuck, ijis provided with diametrically opposite denings 10-40, preferably in a transaxiaff plane substan tially at right chute g. Below the plane of the stub 4 the chuck is flattened, and thefnnrrower sides or, edges of this flattened portion are grooved longitudinally, commencing at about the plane of the stub and extendin angles to that intersecting to the lower end of the cliu ck, to provi e seats for the corrcspondirig jaws 12, 12.

, treinities of the jaws, and said jaws will be forced apart as the screw is forced down between them by the bit 26, but will hold said screw straight and steadywhile it is I being driven into the work.

ward ends (it 15), which latteris fulcrumed between the The shaft (Z is tubular and its upper end extends above the vertical bearing a suit-.

able distance and is surrounded by the sleeve 15. Both above and below this sleeve-said shaft at screwthreaded, and has nuts 1(S and}? thereon below said sleeve, and a collar 18 above the ame, by means of which the sl'eevo is prevented from moving longitudinally independent of the shaft, and yet permits said shaft to revolve therein. Sleeve 13 is engaged at points dian'ietrically oppo-ite each other by the bifurcated fora horizontally disposed lever upper ends of the links 20, and has its rear .materi al,

end connected by the rod 21, to a suitable treadlc, which ings but which is of a common construction. The lower ends of the links 20 are pivotally connected to a vertical webbing extending back from the vertical bearing 1: and connecting the same to the supporting plate (l, and the rear branch of the lever 19, is connected by the coil expansion spring 23, directly or indirectly to the plate C, and keep the forward end of the latter normally at the limit of its upward movement. hen the foot is pressed upon the treatlle, the forard end of the lever 19 moves the shaft (Z downward. The upper end of the collar 18 y is flared or flanged circuniferentially to provide a seat 24 in its upper end for a friction disk :25 of wood fiber or other sultal'ile The bit 26 is removahly secured in the lower end ofa verti a] shaft 7, which latter is of such diameter and length that it: extends up through the bore of shaft dyand beyond the upper end thereof a suitable distance. The bit extendsdown through a suitable distance, moved tl() \\'ll\\"lll'(l the lever 15), will The upper portion of shaft 7, extends above it e upper end of shaft 1], and is proa 'i-d ed with a friction-head 27, which latter conof a cylindrical or other shaped boss ha ing its lower end flanged circumferenand with the lower face thereof op- .ug the frictioirdisk 25 provided with annular head, which is, preferably tl'll do not show in the draw-- one at a time,

angular in cross section, engaging said facing 25. the shaft 7 screw-tln'eadcd and is provided with gage-nuts 28, and between these nuts and the upper end of the friction-head, saidshaft is surrounded by a compressed coil spring 29. By tightening up the nuts and has its apex 28 the pressure of the friction-head 2T against the friction-disk 25 of the collar 18 may be adjusted so that when the bit has driven the screw into the work a sufficient distance. the resistance to the further progress'of the screw will be so great that the hcad 2 7, and, consequently, shaft 7, which derives its motion from shaft (Z through the medium of the head 27, will not revolve.

Sleeve 15 provided with a lateral arm 30. the extremity of which is provided with a suitable ring-shaped boss through the opening in which the upper end of plunger 2 freely passes. From this boss the plunger 2 extends down through a suitable guideopening in the upper portion of the bracket I), and is provided with' adjustable collar-'32 below the guide-opening, which determines the extent of its up- .ward movement, and is also-provided a suit able distance above the guide-opening in said bracket with an adjustable collar 33, between which and the upper end of the bracket said plunger is provided with a con'ipressed coil spring 39, that" assists in keeping the plunger normally, at the limit of its upward movement. At first the downward movement of shaft plunger 2, but when it has traveled sufficiently for the boss on the end of arm 30 to engage collar-B3, the plunger will be moved downward thereby far enough to force the a longitudinally screw in the runway immediately nnder-itinto chute g, Collar the plunger 2, until shaft 33 is adjusted sothat. does not move downward (l and bit 7 are nearly at the limit of their downward movement, and so' that it is only during the withdrawal movement of the bit that the screw is fed to the screw-holding chuck.

\Vhat I claim as new is z- 1. A screw driving machine comprising means for holding the screw, abit, a-longi tuclinally reciprocal vertical shaft, frictional devices through the medium of which said bit derives motion from said shaft pressing axially of said bit to secure the desired friction and mounted to movement of the bit so that the amount of friction is not affected by said longitudinal movement of the bit, and devicesfor feeding scrchs to said screw-holding means.

2. In a screw driving machine, the combination with a screw-holding chuck, and a magazine for feeding screws to said chuck of a longitudinally reciprocal revoluble shaft, a bit alining withand-extending beyond the same, and frictional The ul l er end of (1 does not affect 1 0 share the longitudinal bearings,

means pressing axially of the bit to secure the desired friction and mounted to share the longitudinal movement of the bit so that the amount of friction is not affected by said longitudinal movement of the bit.

3. In a screw driving machine, the combination with a screw holding chuck, and a magazine from which screws are fed to said not affected by said longitudinal movement of the bit.

4. In a screw driving machine, the combination with a screw-holding chuck, and: a magazine for feeding screws to said chuck one at a time, of a longitudinally reciprocal revoluble shaft, an inner shaft extending through the same, a bit alining and revoluble with said inner shaft and extending beyond the latter, and frictional means for imparting the motion of said tubular shaft to said inner shaft and bit, said means pressing axially of the bit to secure the desired friction and mounted to share the longitudinal movement of the bit so that the amount of friction is not affected by said longitudinal movement of the bit.

5. In a screw drivingmachine, the combination with a screw holding chuck, and a magazine from which screwsare fed to said chuck one at a time, of a longitudinally reciprocal revoluble tubular shaft, an inner shaft extendin throu h the same, a bit alining and revolu le wit said inner shaft and extending beyond the same, and sprin actuated frictional devices through'the me inm of which the revoluble motion of said tubular shaft is imparted to said inner shaft and 4 bit, said means pressing axially of the bit to secure the desired friction and mounted to share the longitudinal movement, of the bit so that the amount of friction is not affected by said longitudinal movement of the bit.

6. A screw driving machine comprising a screw-holding device, a revoluble bit reciprocal longitudinally independent of its bearings, a magazine, and a longitudinally reciprocal plunger for ejecting the screws one at a time from saidmagazin'e which has a movement'dela ed so as to coincide with {)he finlshof the ownward'movement ofjthe 1t. Z

7 A'screw driving machine comprisingga screw-holding device, a revoluble bit reciprocal longitudinally independent of its a magazine, and a longitudinally reciprocal automatically returnable plunger for ejecting the screws one at a time from said magazine which has a movement delayed so as to coincide with the finish of the 65 downward movement of the bit.

8. A screw driving machine comprising a;

a revoluble bit recipscrew-holding device, rocal longitudinally independent of its bearings, a longitudinally reciprocal shaft from which said bit derives motlon, a ma zine, and a vertically reciprocal plunger or ejecting the screws from the magazine one at a time; said plunger being; actuated by said shaft, and having a movement delayed so as to coincide with the finish of the downward movement of the bit.

9. A screw driving machine comprising a screw-holding device, a revoluble bit reciprocal longitudinall independent of its bearings, a lon itu inally reciprocal shaft from which sai bit derives motion, a ma azine, and a vertically reciprocal plunger or ejecting the screws from the magazine one at a time, means operatively connecting said shaft and plunger, which latter has a movement delayed so as lfinish of the downward movement of the it.

10. A screw driving machine com rising arevoluble it 15- a screw-holding devlce, ciprocal lon 'tudinally independent of its bearings, a on itudinally reciprocal shaft from which sai bit derives motion, a magazine, and a longitudinally reciprocal plunger for ejecting the screws from the magazine one at a time, adjustable means operatively connecting sai shaft and plunger, which latter has amovement delayed so as to coincide with the finish of the downward movement of the bit.

11. In a screw driving machine, the combination with a-magazine, a lon 'tudinall reciprocal plunger, and a chute into whic said plunger discharges screws from said magazine one at a time, of a suitable tubular chuck alining with the bit,- opposin' jaws pivoted to the sides of said chuck avin their lower ends normally pressing towar each other, and suitable grooves in their opposing extremities, and a revoluble bit reciprocal independent of its bearings.

12. In a screw driving machine, the combination with a suitable magazine, a longitudinallyreciprocal plunger, and a chute into which said plunger discharges screws from said magazine one at a time, tubular chuck alining with the bit, jaws ivoted to the sides of said chuck havin 't eir lower ends normally pressed} towa each other, and having suitable grooves in their opposing extremities, a tubular filler in the bore of said chuck having an o ening in its side commnmcatingwith the ore of said chute, and having openings ad'acent to its lower. extremity through whic the lower ends of sard'jaws enter, and a revoluble bit rec procal independent of its bearings.

to coincide with the of a suitable engaging the flanged end of said collar and a spring interposed between said nuts and headf 14. In a screw driving machine, the combination with a screw holding chuck, and a -magazine from which. said screws are supplied to said chuck one at a time, ofa longi-- tudina-lly reciprocal revolving tubular shaft, a collar surrounding and secured to the upper end of the same having its upper end flanged circumferentially and provided with a depressed seat in its upperface, a disk in said seat, a rotatable bit reciprocal longitudinally through said tubular shaft independent of its bearings, gage-nuts on the upper end thereof, a head on said bit engaging the said disk, and a spring interposed-between said nuts and head.

15. In a screw driving machine, the combination with a screw holding chuck, and a, magazine from which said screws are supplied to said chuck one at a time, of a longitudinally reciprocal revolving tubular shaft,

a collar surrounding and secured to the upper end of the same the upper end of which 'is flanged circumferentially and has a depressed seat in its upper face, a diSK in said seat, a rev'cflublebit reciprocal longitudinally through said tubular shaft independent of its bearings, gage-nuts on the upper end thereof, a head splined on said bit having an. annular bead projecting from the lower face thereof engaging the said disk, and a spring interposed between said nuts and head.

' 16. In a screw driving machine the combination with a suitable magazine, a chuck for holding the screw to be driven, and a revoluble bit reciprocal independent of its bearings, of a longitudinally reciprocal revoluble shaft through which motion is. imparted to said bit, a sleeve'loose on the upper end of said shaft but movable longitudinally therewith and having a laterally projecting arm, and a plunger the upper end of which is adjustably secured to said arm, and the lower end of which is adapted to engagethe screws in the runway of the magazine and expel them one at a time.

17. A screw driving machine comprising ascrew-holding device, a revoluble bit reciprocal independent of its bearings, a longitu- ,dinally reciprocal shaft from which said bit derives motion, a magazine, and a reciprocal plunger for ejecting the screws from the magazine one at. a time, and adjustable means operatively connecting said shaft and plunger.

In testimony whereof I have hereunto set my hand and seal this 15 day of March,

' WILSON P. HUNT. [a s. l

' Witnesses:

Omvn P. Hana, FRANK ODEAN. 

